Subj. with many unknowns

This crossword clue is for the definition: Subj. with many unknowns.
it’s A 24 letters crossword puzzle definition.
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Possible Answers: ALG.

Last seen on: Wall Street Journal Crossword – June 23 2022 – Clear Skies

Random information on the term “ALG”:

Advanced Landing Grounds (ALGs) were temporary advance airfields constructed by the Allies during World War II during the liberation of Europe. They were built in the UK prior to the invasion and thereafter in northwest Europe from 6 June 1944 to V-E Day, 7 May 1945.

Unlike the permanent airfields built in the United Kingdom and designed for the strategic bombardment of Germany, the tactical combat airfields on the continent were temporary, often improvised airfields to be used by the tactical air forces to support the advancing ground armies engaged on the battlefield. Once the front line moved out of range for the aircraft, the groups and squadrons moved up to newly built ALGs closer to the ground forces and left the ones in the rear for other support uses, or simply abandoned them.

When the Allies invaded Normandy on D-Day, Royal Air Force Airfield Construction Service engineers were among those in the initial assault waves. Their mission was to rapidly construct forward operating airfields, known as Advanced Landing Grounds (ALGs), on the European continent. As the Allied armies advanced across France and into Germany, several hundred airfields were built or rehabilitated for use by the allied air forces.

ALG on Wikipedia